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In page Justice:

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Western thinkers later advanced different theories about where the foundations of justice lie. In the 17th century, philosophers such as John Locke said justice derives from natural law. Jean-Jacques Rosseau was one of the advocates for social contract theory which states that justice derives from the mutual agreement of members of society to be governed in a political order. In the 19th century, utilitarian philosophers such as John Stuart Mill proposed that justice is served by what creates the best outcomes for the greatest number of people.[citation needed]